NicKLEs AND BAssLEi!.] CATALOGUE OF GENEKA AND SPECIES. 333 



Nicholsonia an^ulata Davis. Not a fossil. 



1885. Nii'liolsoiiia anguhita. Davis, Kentucky Foss. Corals, Part II, pi. Ixxx, 16. 

 Hamilton: Falls of the Ohio. 



Nicholsonia canadensis Davis. See Hederella t-anadensis (Nicholson). 

 Nicholsonia pavonica Waa^cn and Wentzel. Sec Escharopora pavo- 



nia (D"'0r))ign3'). 

 Odontotrvpa Hall. See Biiskopora Ulrich. 

 Odontotrypa alveata Simpson. See Buskopora bistriata (Hall). 

 Oniniretepora D'Orbigny. Not recognized. (See Geol. Sur. Illinois, 



VHI, p. 087). 

 1850. Oniniretepora D'Orbigny, Prodr. de Pal., I, p. 45. 



Onniiretepora anastomosa D'Orbigny. Not recognizable. 



1850. Oniniretepora anastomosa. D'Orbigny, Prodr. dePal.,I, ]>. 45. 

 "Etats-Unis, failles de I'Ohio." 



ORBIPORA Eichwald. Genotype: Orbitidites distinctus Eichwald. 

 1829. Orbitulites. Eichwald, Zool. Spec, I, p. 179. (Name was preoccupied.) 

 1860. Orliitulites. Milne-Edwards, Hist. Nat. desCoralL, III, p. 271. 

 1856. Orbipora. Eichwald, Bull, de la Soc. des Natural, de Moscou, XXIX, p. 92. 

 1860. Orbipora. Eichwald, Lethfea Rossica, I, p. 484. 

 1877. Orbipora. Dybowsky, Die Cheetetiden der Ostbaltischen 8ilur-Form., 



p. 57. 

 1881. Orbipora. Nicholson, Genus Monticulipora, p. 24. 



1886. Orbipora. Waagen and Wentzel, Pal. Indica, Ser. XIII, pp. 874, 876. 

 Obs. The validity and systematic position of this genus are still in ques- 

 tion. Of Eichwald's original species, as identitied ])y Dybowski, the 

 Orbipora distincta is closely related to Chtetetes discoideus Nicholson, 

 which we have doubtfully referred to Amplexopora, as it has certain 

 characters which may require its removal to the Heterotrypidse; the 

 Orbipora panderi is very different, being an unequivocal Hemiphragma. 



ORTHOPORA Hall. Genotype: Trematopora regularis Hall. 



1886. Orthopora. • Hall, Fifth Ann. Rep. State Geologist New York for the year 



1885, explanation pi. xxv. 



1887. Orthopora. Hall and Simpson, Pal. New York, VI, pp. xiv, 16. 

 1889. Orthopora. Miller, North American Geol. Pal., p. 313. 



Ol)s. Simpson appears to give up Orthopora by referring the genotype to 

 Rhombopora (Fourteenth Ann. Rep. State Geologist New York for the 

 year 1894, pi. xix, 10,11); but until the type species is better known 

 the genus had best be allowed to stand. 



Orthopora bispinulata (Hall). 



18S3. Callopora l)isj)inulata. Hall, Trans. Albany Institute, X, p. 182 (abstract, 



1881, p. 182). 

 1884. Callopora bispinulata. Hall, Rep. State Geologist New York for the year 



1883, p. 14. 

 1887. Treniato])ora (Orthopora) bispinulata. Hall and Simpson, Pal. New 



York, VI, p. 182, pi. Iv, 27-30, pi. Ivi, 16-18. 

 1889. Acanthoclema bispinulatum. Miller, North American Geol. Pal., p. 291. 

 1889. Orthopora bispinulata. Miller, North American Geol. Pal., p. 313. 

 Hamilton: Moscow, New York. 



Orthopora canaliculata (Hall). 



1879. Trematopora canaliculata. Hall, Thirty-second Ann. Rep. New York State 

 Museum, p. 151 (reprint, 1880, p. 13). 



